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A measurement of electron-tau universality from decays of intermediate vector bosons at the CERN\(\bar pp\) collider

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Zeitschrift für Physik C Particles and Fields

Abstract

The ratio of branching fractions of theW decaying to τ ande leptons is measured using\(\bar pp\) collisions at\(\sqrt s = 630\) GeV. The ratio of the electroweak charged current couplings to theW is then determined to beg W τ /g W e =0.997±0.056 (stat.)±0.042 (syst.). The decay modeZ→τ+→τ+ is observed and also found to be consistent withe-τ universality.

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Author information

Author notes

  1. G. Blaylock

    Present address: University of California, Santa Cruz, California, USA

  2. K. F. Einsweiler

    Present address: Lawrence Berkeley Laboratory, Berkeley, California, USA

  3. M. Fraternali & L. Perini

    Present address: Istituto di Fisica, Università di Palermo, Italy

  4. K. Hara

    Present address: University of Tsukuba, 305, Tsukuba, Ibaraki, Japan

  5. K. Hultqvist

    Present address: University of Stockholm, Stockholm, Sweden

  6. E. Iacopini

    Present address: Scuola Normale Superiore, Pisa, Italy

  7. M. Livan

    Present address: Dipartimento di Fisica, Università di Cagliari, Italy

  8. K. Meier

    Present address: Deutsches Elektronen Synchrotron, Hamburg, Federal Republic of Germany

  9. M. Morganti

    Present address: Dipartimento di Fisica e INFN di Bologna, Università Bologna, Italy

  10. M. Primavera & M. Valdata-Nappi

    Present address: Dipartimento di Fisica dell'Università della Calabria e gruppo INFN, Cosenza, Italy

  11. A. R. Weidberg

    Present address: Nuclear Physics Laboratory, University of Oxford, Oxford, UK

  12. P. S. Wells & S. A. Wotton

    Present address: CERN, Geneva, Switzerland

Authors and Affiliations

  1. Laboratorium für Hochenergiephysik, Universität Bern, Sidlerstrasse 5, CH-3012, Bern, Switzerland

    K. Borer, A. Federspiel, K. Hara, E. Hugentobler, R. Moning, L. Müller, T. Pal, K. Pretzl & J. Schacher

  2. Cavendish Laboratory, University of Cambridge, CB3 0HE, Cambridge, UK

    R. S. DeWolf, D. J. Munday, M. A. Parker, S. L. Singh, P. S. Wells, T. O. White & S. A. Wotton

  3. CERN, CH-1211, Geneva 23, Switzerland

    G. Blaylock, L. DiLella, K. F. Einsweiler, D. Froidevaux, O. Gildemeister, S. Hellman, J. Hrivnac, K. Hultqvist, K. Jakobs, P. Jenni, M. Lefebvre, L. Linssen, P. Lubrano, L. Mapelli, K. Meier, M. Nessi, F. Nessi-Tedaldi, C. Onions, J. M. Pentney, M. Pepe, H. Plothow-Besch, G. Polesello, A. Poppleton, V. Simak, S. Stapnes & A. R. Weidberg

  4. Lehrstuhl für Exp. Physik IV, Universität Dortmund, W-4600, Dortmund, Federal Republic of Germany

    C. Gössling, H. Hufnagel, V. Sondermann & E. Tsesmelis

  5. Institut für Hochenergiephysik der Universität Heidelberg, Schröderstraße 90, W-6900, Heidelberg, Federal Republic of Germany

    S. Grünendahl, E. E. Kluge & N. Kurz

  6. School of Physics, University of Melbourne, 3052, Parkville, Australia

    I. A. Bertram, G. F. Egan & S. N. Tovey

  7. Dipartimento di Fisica dell'Università di Milano and Sezione INFN Milano, I-20133, Milano, Italy

    M. Bonesini, D. Cavalli, G. Costa, L. Cozzi, A. Cravero, F. Gianotti, J. Incandela, L. Mandelli, M. Mazzanti & L. Perini

  8. Laboratoire de l'Accélérateur Linéaire, Université de Paris-Sud, F-91405, Orsay, France

    R. Ansari, D. Buskulic, J. C. Chollet, L. Fayard, J. M. Gaillard, B. Merkel, M. Moniez, G. Parrour, P. Petroff, J. P. Repellin, G. Unal & D. R. Wood

  9. Dipartimento di Fisica Nucleare e Teorica, Università di Pavia and INFN, Sezione di Pavia, Via Bassi 6, I-27100, Pavia, Italy

    G. Ambrosini, C. Conta, A. Dell'Acqua, R. Ferrari, M. Fraternali, G. Fumagalli, V. G. Goggi, M. Livan, F. Pastore, E. Pennacchio, G. Polesello, A. Rimoldi, M. Sacchi & V. Vercesi

  10. Sezione di Perugia, Dipartimento di Fisica dell'Università di Perugia and INFN, Via Pascoli, I-06100, Perugia, Italy

    P. Cenci, P. Lariccia, P. Lubrano, M. Punturo, P. Scampoli, C. Talamonti & F. Tondini

  11. Sezione di Pisa, Dipartimento di Fisica dell'Università di Pisa and INFN, Via Livornese, S. Piero a Grado, I-56100, Pisa, Italy

    D. Autiero, G. Carboni, V. Cavasinni, F. Costantini, M. Curatolo, T. DelPrete, B. Esposito, E. Iacopini, S. Lami, M. Morganti, C. Petridou, M. Primavera & M. Valdata-Nappi

  12. Centre d'Etudes Nucléaires de Saclay, F-91191, Gif-sur-Yvette Cedex, France

    J. Alitti, P. Bareyre, P. Bonamy, M. Bourliaud, Y. Ducros, C. Magneville, J. P. Meyer, A. V. Stirling, H. Zaccone & A. Zylberstejn

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  1. J. Alitti
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  2. G. Ambrosini
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UA2 Collaboration., Alitti, J., Ambrosini, G. et al. A measurement of electron-tau universality from decays of intermediate vector bosons at the CERN\(\bar pp\) collider. Z. Phys. C - Particles and Fields 52, 209–218 (1991). https://doi.org/10.1007/BF01560438

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  • DOI: https://doi.org/10.1007/BF01560438

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